[R] replace NA with factor class

[Tord Snall]

Dear all,

I have a tree data matrix. For some trees I lack info about tree species,
but I want to set them to be spruce. For some reason the tree species names
on the remaining (non-NA) rows are changed into numbers (that I do not
recognise).

I guess that ifelse is not the correct function to use, but I have not
found any better one in my searches.

Thanks in advance!

Sincerely,
Tord


> test
      ObjektID tree.sp Diameter
2030 S.2001.S5    <NA>        2
2034 S.2001.S5    <NA>        2
1          S.1   spruce       2
2          S.1    birch      12
3          S.1   spruce       7
4          S.1   spruce       5
5          S.1    birch       8

> test$tree.sp6<- ifelse(is.na(test$tree.sp) == T, "spruce", test$tree.sp)

> test
      ObjektID tree.sp Diameter tree.sp6
2030 S.2001.S5     <NA>        2      spruce
2034 S.2001.S5     <NA>        2      spruce
1          S.1   spruce        2         8
2          S.1    birch       12         3
3          S.1   spruce        7         8
4          S.1   spruce        5         8
5          S.1    birch        8         3


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Tord Snäll
Avd. f växtekologi, Evolutionsbiologiskt centrum, Uppsala universitet
Dept. of Plant Ecology, Evolutionary Biology Centre, Uppsala University
Villavägen 14			
SE-752 36 Uppsala, Sweden
Tel: 018-471 28 82 (int +46 18 471 28 82) (work)
Tel: 018-25 71 33 (int +46 18 25 71 33) (home)
Fax: 018-55 34 19 (int +46 18 55 34 19) (work)
E-mail: Tord.Snall at ebc.uu.se
Check this: http://www.vaxtbio.uu.se/resfold/snall.htm!
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